I know they never have children but if they did, who was going to rule what? Would the first son eventually become the King of France and the second son the King of Scotland? Mary was an only child so if she had kids with Francis, one of them would have needed to take over Scotland after her death? I feel like this is a huge hole in the plan - did anyone think about this? Wouldn't their kids be (for lack of a better term) the property of France? It seems like such a big deal since she is an only child and would need an heir. It seems like an EXTREMELY flawed plan to marry a queen to a future King, when both are going to need heirs for their country.

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Mods - I know we're not typically allowed to do what if scenarios but I hope this one can stay. I've been mulling over this for weeks and am still confused what the protocol would have been. Essentially, please don't remove this as my head is going to explode if I can't get an answer. It's absolutely driving me MAD!